<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		
		<script>
			
			var stu2 = {
				id:2,
				name:"王五",
				age:19
			}
			
			// 1. for ... in .
			
			for(var i in stu2)
			{
				document.write(i+","+stu2[i]+"<br />")
			}
			
			// 2. with 语句 (在with语句块中 可以省略不写 stu2)
			with(stu2)
			{
				document.write(id+","+name+","+age);
			}
			
			
			
			
		</script>
	</body>
</html>